Three days after San Benito High School seniors were forced to cancel their senior trip to Disneyland because of food poisoning, health officials said they may never know the exact cause of illness.

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The day before their Friday trip, the seniors were treated to a luncheon during a lunchtime rally. On their way to Disneyland, dozens of kids started complaining of stomach problems and diarrhea.

"We will never know unless we have a piece of the actual product that was contaminated, or a stool sampling or vomit. There's no way of testing. You can't test, you can't determine what the culprit is," said Samela Perez, a county health official.

Roughly 300 seniors were on buses about halfway to Disney when they were forced to turn back. About 80 seniors complained of symptoms. Underclassmen who ate the leftovers also got sick.

"I regret eating the sandwich," sophomore Andrew Valles said.

The meat was bought at a Hollister Safeway and cooked up by parents of students. County health officials said the problem likely originated from poor food handling.

"That can be everything from the time you take it out of its package to preparing it and disseminating it to the people that are ingesting it. So a lot could've happened between the time it came out of its package to the time it got to the youth and ingested," Perez said.

School officials are trying to reschedule to the senior trip, but if they can't pull it off, all of the students would be refunded $300.